The nitrite content of pickled vegetables is the highest when the pickling time is 3 to 8 days. According to the relevant public information, scientific determination shows that the nitrite content of pickles reaches its peak on the 3rd-8th day, starts to decline after the 9th day, and basically disappears after the 2th day. Therefore, pickles with short curing time should be eaten within 2 days, and those with long curing time should be eaten after one month.